Butterfly valve assembly with continuous annular sealing means



NOV- 3, 1953 F. G. MULLER I 2,657,896

BUTTERFLY VALVE ASSEMBLY wITH CONTINUOUS ANNULAR SEALING MEANS 2 Sheets-Sheet l Filed July 6, 1948 ATTORNEY 2 Sheets-Sheet E Nov. 3, 1953 F, G. MULLER BUTTERFLY vALvE ASSEMBLY WITH CONTINUOUS ANNULAR SEALING MEANS Filed July 6, 1948 rwwvkw JAMA. 2,. www

ATTORNEY Patented Nov. 3, 1953 TUT invehtinfrelats to a butteryvalvefasterribly, fwith conti'n Y l annular sealing means.

'object o'f 'the invention `is to 'provide a 'valve assembly of the character describdsp-ecially desigie'dfor sewhere "the valve is required to completely shut :olf the flow of uid without leakage when tl'fe 'va-Ive is iny losel position.

It is another object of the inventiontoprovide, in an assembly of the character described, novel I,Ineas,"fr forming leak proof seals not only between th'ejvaive `'and easing ibut also at' the shaft -B afafriiigsighevalve casing ais'to displace the iisu'al js'tufiing boi: arrangement. K i, n

` `Pinarily the invention Ae'x'rilc'odies novelfrneans, car'rie by'fheva1va-rrf6fming a continuous lseal between `th`e"'valve and y'casing and around the stiibshafts when the 'valve is in ciosu position.

Other objects and advantages will be apparent from the following specification which is illustrated by the accompanying drawings wherein- Figure l is a cross-sectional view of the valve assembly taken on the line I-I of Figure 2.

Figure 2 is a longitudinal, sectional view taken on the line 2 2 of Figure 1 and showing the valve closed.

Figure 3 is an enlarged, fragmentary edge view of the valve illustrating one type of valve hub.

Figure 4 is a fragmentary, sectional view thereof.

Figures 5 and 6 show end elevational and side elevational views, respectively, of annular inserts employed.

Figure 7 is a fragmentary, plan view of the assembly.

Figure 8 is a fragmentary, sectional view showing the valve in closed position.

Figure 9 is an enlarged, fragmentary edge view of the valve illustrating a modified form of valve hub.

Figure 10 is a fragmentary, sectional view thereof.

Figure 11 is an edge view of the circular valve seal after being fitted upon the valve disc.

Figure 12 is an elevational view thereof, and

Figure 13 is a fragmentary, transverse, sectional view showing the valve hub seal.

Referring now more particularly to the drawings the numeral I designates a. form of valve casing which may be employed.

The disc valve` 2 is mounted in this casing.

'tate in similar aligned be' ,as formed with the ,transversely di portions, as vf6a, which u' surround kone side of the correspon portion of the val mg shaft, 'and oh he In `the present illustrati* a plane arcuate face, as'b (as bf'estA Figure 9), which fits rclosely against the opposing when the seai ring `'l ihi'da it win be in the form of a plane circular ring but when fitted into the groove 6, 6a it will be of the shape indicated in Figures 11 and 12, that is, the portion of it partly surrounding the corresponding shaft and lying in the groove 6a will be offset with respect to the plane of the ring, as is more clearly indicated in Figure 11.

As indicated in Figures 3 and 4, in this form of the valve hub there is a continuous circular socket, as 6c, formed in the outer margin oi the valve around each shaft bearing and provided to receive a ller block, as 6d.

The outer face of this block 6d on one side of shaft is flush with the outer periphery o1' said valve but on the other side is arcuately grooved to form a continuation of the groove 6 around the shaft thus providing, in this form, the arcuate groove 6a and the plane face 6b as in Figure 9, and in this form the seal ring 1 is installed in identically the same manner as heretofore explained.

In both forms the shafts 3 and 3a are provided with external annular grooves 8 within the bearings 4 to receive conventional O-rngs 9 to form elective seals between the valve casing and the stub shafts on which the valve is mounted, said shafts forming, in effect, a stem on which the valve operates.

In installation the seal ring 1 is seated in the groove 6, 6a. The ring I is preferably moulded round in cross-section but, as hereinbefore stated, the groove 6, 6a is preferably dovetailed in crosssection so as to allow the sealing material to W There is a 'l toward the corner of the groove when subjected to compression.

When the seal ring is installed on the valve the valve may then be located in the casing and the stub shafts I, la then installed, as illustrated in Figure 1.

It will be noted from an inspection of the iigures that the disc-like valve 2 is of slightly less transverse diameter than the inside transverse diameter of the casing but the cross-sectional diameter of the seal ring 1 is slightly greater than the distance between the bottom of the groove 6, la and inside of the casing when the valve is closed so that when installed the seal ring will be under slight compression to obtain an initial, uid tight, seal.

As illustrated there is an operating lever i fixed on the outer end of the stub shaft l and whose range of movement is limited by spaced stops Il, ii so that the valve may be moved to completely closed position, as shown in Figure 2, or to open position, as shown in dotted lines in Figure 2.

As the valve is moved toward closed position the seal ring 1 progressively seals the clearance spaces between the valve 2 and the inside wall of the valve casing until the valve is turned to a perpendicular position relative to the flowway of the valve casing whereupon the entire periphery oi the valve is sealed with the casing wall so as to form a iluid tight seal; however, the portions of the ring 1 within the arcuate portions 8a of the groove 8 are under compression at all times and in all positions of the valve, the compression varying slightly. if at all. during the valve movements.

The uid pressure exerted on the seal ring 1 will tend to squeeze the sealing material thereof more firmly into the clearance spaces of the groove 6, 8a when the valve is closed, thus forming a fluid tight seal throughout.

The drawings and description are illustrative merely while the broad principle of the invention will be denned by the appended claim.

What I claim is:

A valve assembly comprising, a casing having a passageway for fluid therethrough and also having stem bearings, a disc-shaped valve in the casing movable to one position to close said passageway and to another position to open the passageway, said valve being formed with oppositely disposed hubs, a stem in said bearings to which the valve is secured, the outer ends of said hubs each having a circular socket around the stem. a ller block in each socket, said valve having a continuous peripheral groove formed with arcuate portions extending through said illler blocks on one side of the stem, said filler blocks presenting ush faces on the other side of the. stem which fit closely against the inner wall oi the housing, and a continuous annular seal rinf,r fitted into the groove of said valve and filler blocks and forming a continuous seal with the housing all the way around the valve when the valve is closed.

FRANKG. MULLER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,682,075 Foulds Aug. 28, 1928 1,813,126 Sheppard July 7, 1931 1,860,619 Pfau May 31, 1932 2,385,510 Harwood Sept. 25, 1945 2,427,787 Hunter Sept. 23, 1947 FOREIGN PATENTS Number Country Date 177,010 Switzerland of 1935 435,059 Great Britain of 1935 887,167 France of 1941 

